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This sounds like a pretty straightforward thing to fix. Just need to browse one of the license compatible icons sets like Tango, to find a good match.

Created attachment 748804 [details]
USB redirection icon

Created attachment 748807 [details]
USB redirection dialog

Jakub, could you help us find or design the right icon for the job? Or if you have other solution to propose.

It's an button icon shown in the full overlay toolbar of virt-viewer to open up the USB redirection dialog, see attached screenshots.

thanks

Created attachment 793682 [details]
24x24px usb icon

I don't think the logo works particularly, but here goes.

Created attachment 793684 [details]
source SVG

taking

moving to POST:
https://www.redhat.com/archives/virt-tools-list/2014-March/msg00085.html

I can reproduce with package: virt-viewer-0.5.6-10.el6.x86_64
and verified with new build: virt-viewer-0.6.0-5.el6.x86_64

steps:
1.prepare a guest with usbredirection support.

1.1 Prepare a .cfg file in /etc/qemu:

# cat ich9-ehci-uhci.cfg

###########################################################################
#
# You can pass this file directly to qemu using the -readconfig
# command line switch.
#
# This config file creates a EHCI adapter with companion UHCI
# controllers as multifunction device in PCI slot "1d".
#
# Specify "bus=ehci.0" when creating usb devices to hook them up
# there.
#

[device "ehci"]
  driver = "ich9-usb-ehci1"
  addr = "1d.7"
  multifunction = "on"

[device "uhci-1"]
  driver = "ich9-usb-uhci1"
  addr = "1d.0"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "0"

[device "uhci-2"]
  driver = "ich9-usb-uhci2"
  addr = "1d.1"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "2"

[device "uhci-3"]
  driver = "ich9-usb-uhci3"
  addr = "1d.2"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "4"


1.2 Create a new spice-enabled vm using virt-manager, select spice as display type and qxl as video card model, when asked if you want to enable the agent channel, say yes.

1.3 When done, close virt-manager and edit the relevant /etc/libvirt/qemu/sound.xml file. Change the first line to:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
And add the following lines at the end, above the "</domain>" line: 

  <qemu:commandline>
     <qemu:arg value='-readconfig'/>
     <qemu:arg value='/etc/qemu/ich9-ehci-uhci.cfg'/>
     <qemu:arg value='-chardev'/>
     <qemu:arg value='spicevmc,name=usbredir,id=usbredirchardev1'/>
     <qemu:arg value='-device'/>
     <qemu:arg value='usb-redir,chardev=usbredirchardev1,id=usbredirdev1,bus=ehci.0,debug=3'/>
     <qemu:arg value='-chardev'/>
     <qemu:arg value='spicevmc,name=usbredir,id=usbredirchardev2'/>
     <qemu:arg value='-device'/>
     <qemu:arg value='usb-redir,chardev=usbredirchardev2,id=usbredirdev2,bus=ehci.0,debug=3'/>
     <qemu:arg value='-chardev'/>
     <qemu:arg value='spicevmc,name=usbredir,id=usbredirchardev3'/>
     <qemu:arg value='-device'/>
     <qemu:arg value='usb-redir,chardev=usbredirchardev3,id=usbredirdev3,bus=ehci.0,debug=3'/>
  </qemu:commandline>

1.4 close down any virtual machines you may have open , and restart libvirtd
 # service libvirtd restart

2. use virt-viewer to open an existing guest.
# virt-viewer sound
or
# remote-viewer spice://ip:port

3. click view->full screen
we can see USB icon for USB device redirection "USB device selection".

so changed from "ON_QA" to "VERIFIED".

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1379.html